Calculating device



March 18 1924. I 1 481460 H. HANSSON CALCULATING DEVICE I File Aug. :51, 1922 2 ShaeQQ -Shut l March 18 1924. 1,487,460

H. HANSSON v CALCULATING DEVICE Filed Aug. 31 1.922 2 Sheets-Sheet 2 no I Patented Mar; 1a, 1924.

FATE? FREE.

EALVOR HANSSON, F CHRISTIANILA, NORWAY.

CALCULATING DEVICE.

Application filed August 31, 1922. Serial No. 585,546.

To all whom it may concern Be it known that I, Harmon Hansson, a. subject of the King of Norway, residing at Generalstaben, Christiania, Norway, have invented certain new and useful Calculating Devices, of which the following is a specification.

My invention relates to apparatus for the graphic determination of the value of quan- 19 tity m depending on variable quantities s, t, u, '1), etc., in any number, by virtue of an equation of the form,

i. e., when a function of any 'form of the unknown quantity as is equal to the product of functions of any form of the different variables 8, t, u, o,

The following description and accompany- 29 ing drawings given by way of exam le set fi'orth the principal of the apparatus or the graphic determination according to the invention, as well as two forms of construction of apparatus for obtaining the solution of particular problems, together with details of the same.

In the drawings: Fig. 1 is a diagram showing the principal of the apparatus and Fig. 1 is a modificaac tion of the same.

' Fig. 3 shows a. calculating device for computing artillery fire on an invisible target directed from an observation post, and this apparatus gives at once and for each firing as piece the distance from the target and the direction of arm. r

Fig. 2 is a general diagram indicating the calculations for the same.

Fig. 5 shows a calculating device for topoto graphical observations, and this apparatus at once gives the corrections for the measured sighting angles in order to bring these angles to the proper points. These corrections Y are required by reason of the fact either that the sighting instrument is situated at a distance from the signal, or that the sighted signalis at a certain distance from the point for which it serves as a checking point.

Fig. 4 is a diagram indicating the last said calculations.

. Figs. 6 and 7 represent details of con- 7 struction.

According to Figure 1 starting from a point X on a straight line SR which represents the zero point, there is placed upon the vertical line XX the scale of the function f (a), i. e., the values of flm) are determined for different values of a, as for example, regularly increasing values, and these are marked on the line XX Startin from the zero at X, divisions, which equal, or correspond to, the various determined values of f (:v) are marked off. Opposite said divisions are placed the corresponding values of zv andthen through these divisions, straight lines are drawn parallel to SR. This will afford a series of lines relative to the function f U n another vertical lines SS is formed in ii e manner, by starting from the int S as zero, the scale of the function E28)". On the line TT which is movable with its ends situated on the lines SR and SS the scale of the function f, (t) is drawn, starting from the point '1 as zero. On the line UU which is movable with its ends in lines TR and TT,, is drawn the scale of the function (u), startin On the line V 1 which is movable with its ends in lines UR and UU is drawn the scale of the function f, (1)) starting from the point V as zero, and likewise for further functions.

The maximum values m 8 t,, 14,, c of these scales are connected by the relations It will be further shown that in order to find the value 06 of the unknown quantity corresponding to a group of values s t a c of the variable quantities'it will suffice to locate the end T of the line TT at the point s of the scale SS the end U of line UU at the point i, of the scale TT the end V of the line VV at the point U of the scale UU and to read the value :0 on the line parallel to SR, of the series of m, which passes through the point 4)., of the scale VV,.

The scale of the function f (8) shown in Fig 1 on the line S perpendicular to the series 7 (m) can also (and this is advantaeous in certain cases as will be further s own by a particular exam le) be drawn as inFig. 1 upon a given line SQ, strai ht or curved, and having its origin upon u R from the point U as zero.

and u on which thedivisions of SS, are marke parallel to SR. It is observed in fact that if one places the scale I, (t) at T T so that T shall be situated upon SR and T upon the divisions of S S this scale will remain parallel to its positlon TT, so that the remainder of the construction is made'without chan e. u

The apparatus in icated in Fig.3 ismtended for artillery firing calculations, and it is usedto determine the distance of the target and the angle of aiming for each iece of artillery for firing upon .an HlVlSb le target as directed from an observation post' from which the target can be observed. According to the diagram of Fig. 2, the

observation post is situated at 1, the piece of artillery at 2 and the target at 3. In the triangle 1, 2, ,3 the side 1, 2 is known and is designated by 255 the angle 2, 1, 3 is knownand isdesignated by s, and the approximate distance 1, 3 is known and is desig nated by S. ,To determine the angle 1, 2, 3 by which to indicate to'the piece 2 its direction of aim, it suiiices to calculate the anle X.. If from the point 2 the perpendicuar 2, 4 be drawn to the line 1, 3, there is obtained in the triangle 2, 4, 3

I I in t 1 3.4. S-t cos 8 s fS- t cuss By the equation u can be.

separately calculated.

This afiords, tan a:= si'n s. t.

. This formula which gives a: has the above- 1nd1eated formf (m) :f, (s).,f (t). f, (u).

According to the prmclple above described, this equation can be solved by the apparatus shown in Fig. 3. This apparatus consists of a board 5 having secured to the lower part thereof the rule 6 whose upper edge 7, 8 re resents the zero line of the series of the unction. On this line at 9 is a screw which forms the pivot of a small rule 1.0 containing a scale of the distances if from the observation post to the piece. The end 11 of this rule moves upon a circular line having its center at 9 and whereupon are marked the angles 8, and the scale upon said circle is that o the sine function, and hence the graduation in angles is regular. On the small rule is slidable a slide 12 supporting an axle 13 which is situated at the same dis- I tance from the edge of the rule as the pivot 3, The pivot 13 carries a second rule 14 whose lower edge passes through the pivot 13 and wluch is graduated from the end 15 according to the function 5 giving succescome upon the up er ed e 7, 8 of the rule 6;

the whole device ing in this position, one

observes which line of the series passes through the division U of scale 14, and reads this linethe value w which was to be found.

The apparatus shown in Fig. 5 is intended for a rapid determination, by a simple reading of the corrections, of sighting angles in makin topographical observations when such 0 servatlons, as is generally the case, cannot be made by placlng observing apparatus exactly above the point to which these angles are to be referred, or when the signal which is sighted is at some distance from the oint for which it serves as a reference mar I In Fig. 4, 21 is a point, and-22,23 difi'erent points of the ground to be observed. The apparatus for measuring the angles is disposed at 24 at a distance (a from the point 21. In onset the sighting triangles 24,21, 22, let S be thedistance 21, 22, and 1 the angle measured between the sighted mark 21 I and the observed oint 22, and a: the an le to be calculated. e'then have the equation a sin y.

sin c== that is, sin z=sin 1 (1 g which is in fact an equation having the form F :zf (8).

and supporting an axle 32 dis osed at the same distance from the edge 0 the rule 27 as the pivot 26. At 32 is pivoted a second rule 33 whose lower edge'passes through the center of-the pivot 32. On the board 25 is formed a series of lines representin the scale of the sine function of the an es of the graduation 29 and whereof the inc 0 shown at 34,35] asses through the center of the pivot 26. arallel to, and somewhat below, this line, is mounted a rule 37, and

on the upper edge of the same bears the end of a rule 33 which is constituted by a rounded nose 38 so that the zero mark of the scale 3 of. the ruler33 will always remain upon the function g or according to its logarithm.

The said apparatus is employed in the following manner. The slide 30 is placed on the division corresponding to the distance measured between the point in question and the observing apparatus, and the rule 27*is so disposed that its mark 28 registers with the division corresponding to the measured angle 7 and the end 38 of the rule 33 is brotwht against the upper edge of the rule 37. Inder these conditions, the division of the rule 33 marked S is situated on the line of the series marked as, a: being the value of the unknown quantity sought.

The series a; is graduated in seconds of angle according to regularly increasing values. Should it be required to correct a, great number of observations made upon a given point, the value a will remain constant and the sighting angles will vary in a regular manner, so that the apparatus is readily operated by passing from one observation to another, in each case observing on the rule 33 the value S corresponding to the distance, in question and reading on the series opposite this point of the scale, the value of m which is sought.

If the equation to be solved contains only two factors in the second part, as,

f( )=f1( )-f2( the apparatus can have a very simple construction. It can comprise the parallel series representing the-scale of the function f (w), a scale of the function f, (s) which is to be placed upon a circular line as in the a paratus of Figs. 3 and 5, and a movab e radius such as 10 or 27,.carrying the scale guiding edge 45, 46. In Fig. 7, the graduated scale is placed upon the u per edge of the rule 47 and the lower on is rounded as at 48 in the form of a quarter circle whose center is the zero point of the scale, and the radius the distance between the base line 40, 41 and the guiding edge 45, 46.

What I claim is:

1. Apparatus for solving equations, comprising, in combination, a table, a series'of parallel, straight lines thereon, said lines being spaced to represent values of a given function of the unknown, one of said lines being the origin of the series, a fixed curve on the table graduated to represent values of a given function of the first variable, the origin of the graduations 0n the curve being on the origin of the series, a fixed rule positioned parallel to said straight line origin of the series, a first and a second-smaller rule, graduated to represent values of the different functions of various variables, the origin of the graduations on said second smaller rule being movable along the said straight line origin of the series, a slide mounted on said first smaller rule and slidable the length of the rule, said second smaller rule. bei pivoted on said slide, and said first smaller rule being movable along the length of the curve.

2. Apparatus for the gra hic solution of equations, comprising, a table, a series of parallelstraight lines thereon, one of which is the origin of the series, a circular arc thereon duated to represent angles, the center of said are, and the origin of the graduations thereon being on the straight line origin, a graduated rule, pivoted at one end at the center of said arc, a fixed rule positioned parallel to the straight line origin, a slide member positioned on, and slidable the Ian h of said graduated rule, said slide pivota 1y carrying a second graduated rule, one end of which is movable along the fixed rule.

3. An apparatus according to claim 1, said fixed rule being spaced from the straight line origin, said second smaller rule carryin a supportin shoulder at its end, shoulder being in t eform of a circular sector having its center at the zero of the graduations on the rule, and a radius equal to the distance between the strai ht line origin of the series and said fixed rufia.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

HALVOR HANSSON.

Witnesses DAGNY SYVERSEN, M. Normans. 

